Battery Pouch Adhesive Layout for Drop-Induced Deformation Control
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Solution Overview
Problem
Battery pouches in electronic devices can deform and rupture due to differences in adhesion between tape-attached and tape-free portions, leading to electrolyte leakage and heat generation when subjected to external pressure, such as during a fall.
Innovation Solution
The electronic device incorporates a jelly-roll structure with a polymer layer and strategically positioned adhesive layers to distribute stress evenly, aligning with the roll fixing tape to minimize deformation and rupture of the pouch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If adhesive layers are applied to secure the battery pouch, then the battery is fixed in position, but the pouch deforms due to adhesion differences between taped and non-taped areas under external pressure
Solution Approach 1:
The adhesive application is segmented into multiple discrete regions rather than continuous coverage. The first and second adhesive layers are applied at specific positions on the pouch surface, creating distinct adhesive zones that secure the battery while leaving non-adhesive areas that can deform independently, thus preventing stress concentration and pouch deformation.
Solution Approach 2:
Different regions of the pouch are given different properties: some areas have adhesive layers for securing the battery, while other areas remain without adhesive to allow for deformation under external pressure. This local differentiation of quality enables the pouch to maintain both stability and deformation capability.
2Reliability
If the battery pouch is secured with adhesive layers, then the battery remains fixed during operation, but the pouch may rupture under external pressure such as during a fall
Solution Approach 1:
The adhesive coverage is segmented into specific regions rather than complete coverage. This segmentation allows the pouch to maintain fixation reliability in adhesive zones while creating non-adhesive zones that can deform and absorb impact energy, preventing rupture under external pressure.
Solution Approach 2:
The non-adhesive regions on the pouch surface act as pre-designed cushioning zones that can deform under external pressure. These regions are prepared in advance to absorb impact energy during events like drops, preventing the stress from concentrating and causing pouch rupture.
3Force
If the pouch is completely adhesive to secure the battery, then the battery is firmly fixed, but deformation occurs due to adhesion differences between taped and non-taped portions
Solution Approach 1:
The adhesive force is applied in segmented regions rather than uniformly across the entire pouch surface. The first and second adhesive layers are positioned at specific locations, creating localized high-adhesion zones for secure fixation while maintaining low-adhesion zones that can deform without resistance, thus preventing pouch deformation.
Solution Approach 2:
The pouch surface exhibits local quality differentiation: certain areas possess strong adhesive properties for secure battery fixation, while other areas maintain weak or no adhesive properties to allow free deformation. This spatial variation in adhesive quality resolves the contradiction between fixation strength and deformation prevention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces the likelihood of pouch deformation and electrolyte leakage, effectively managing stress distribution to prevent damage to the battery during external pressure events.
Implementation Method 1
a polymer layer including stretched polystyrene, wherein the polymer layer is disposed between the pouch and the first outer surface or the second outer surface or between the third outer surface and the fourth outer surface
Implementation Method 2
a first adhesive layer disposed between and contacting the pouch and the first face, wherein the first adhesive layer includes a first edge extending in parallel with the third outer surface and a second edge extending in parallel with the fourth outer surface
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
In one embodiment of the disclosure an electronic device comprising a display, a first plate having opposing first and second faces, wherein the display is disposed on the first face, a second plate coupled to the second face of the first plate, at least one adhesive layer including a first adhesive layer adhering to the second face of the first plate, a jelly-roll, a roll fixing tape disposed on one region of the jelly-roll, a pouch containing the jelly-roll and the roll fixing tape, wherein the at least one adhesive layer including the first adhesive layer is disposed between and attached to one face of the pouch, and wherein one end of the first adhesive layer and one end of the roll fixing tape face are in the same direction while the first adhesive layer and the roll fixing tape vertically surround the one face of the pouch.